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Dish-based high concentration PV system with Köhler optics.

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    This study details a high concentration photovoltaic system using a paraboloidal mirror to power triple-junction cells. The novel XRX-Köhler optical design achieved 28% efficiency, with future systems projected to reach 32%.

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    Area of Science:

    • Renewable Energy
    • Optical Engineering
    • Photovoltaics

    Background:

    • High concentration photovoltaic (HCPV) systems require efficient optical designs for effective solar energy capture.
    • Traditional HCPV systems face challenges in uniform illumination and light distribution, impacting cell performance.

    Purpose of the Study:

    • To develop and evaluate a novel XRX-Köhler optical system for high concentration photovoltaic applications.
    • To achieve uniform illumination, minimize optical losses, and ensure even light distribution for efficient series connection of photovoltaic cells.

    Main Methods:

    • Design and construction of an XRX-Köhler optical system featuring a large primary paraboloidal mirror and secondary reflectors.
    • Utilizing a prototype with a 3.3m x 3.3m primary reflector and 36 actively cooled triple-junction cells.
    • Measurement of end-to-end system conversion efficiency under 1200x geometric concentration.

    Main Results:

    • An operational prototype demonstrated a measured end-to-end system conversion efficiency of 28%.
    • The optical design provides high tolerance to mis-pointing and uniform illumination across cells.
    • Parasitic losses from active cooling were included in the efficiency measurement.

    Conclusions:

    • The XRX-Köhler optical system is effective for high concentration photovoltaic applications.
    • The developed design methodology enables efficient series connection and uniform light distribution.
    • Projected efficiency of ~32% for future iterations indicates significant potential for improved solar energy conversion.